Whitelist Asturian (CLDR level > 80%)

Also added some locale variants and update names in comments to
match the latest ICU version (v63.1)

With the latest sources I get this error (with and without my change)
e2fsdroid: Unknown code ____ 234 while configuring the file system

Bug: 119201818
Test: buit, flashed, and tested using an older sync.
Change-Id: I4524acd2e4aa0b2890e2fe4d46be26353c7f835b